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I just spend 14 hours at school.
However, I did avoid most of my classes to play in the chemistry lab blowing up hyrdrogen and playing with random things for the schools open night... but I am tired.
Only decent thing I can think of is Warm water + Bottle + Dry Ice.
Insane amounts of pressure and limited space = big bang.. and possibly a bottle flying a good 20-30 metres into the air.
...BUT 14 HOURS AT SCHOOL SHOULD BE ILLEGAL.

Where do you LIVE that you have to be there 14 hours?

Ah. See, I'm a US person myself. My school days were about eight hours, total. Now I'm off to college, with 17 hours a week of classes and approximately 34-51 hours a week of studying and homework outside the classroom, plus working and trying to keep fit. At least I don't have to take any student loans.